Telephone system.



A. FHANKE. TELEPHONE SYSTEM. APPLICATION FILED SEPT. 3. 1913.

Patentedi June 4:, 1918.- 4v SHEETS-SHEET lw wm A. FRANKE.

TELEPHONE SYSTEM.-

APPLICATKON FILED SEPT. 3. 1913.

' Patented June 4, 1918.

4 SHEETS-SHEET 2.

A F X Q k uw gwggg A FRANKIE.

TELEPHONE SYSTEM.

APPLICATION man SEPT. 3. 1913.

Patented June 4, 1918-.

4- SHEETS-SHEET 3- Blanca mm dm A. FRANKE. TELEPHONESYSTEM. APPLICATIGN FILED SEPT. a. 1913.

m w 4. WW I m w p r u cw I J n W M w W J n 4 J V m .[V a. Y! :m j w r L mm v Kjjm W m hm w this case for connections NEAR BERLIN, BERLIN, GERMANY,

T0 .ciatlltllenii TELEPHQNE SYS'ZEEEQI.

application filed September 3, 152m.

To all whom it may concern;

Be it known that l", Anotr FRALNKE, a German citizen, and resident of Grunewald, near Berlin G'ermany, have invented certain new and useful Improvements in Telephone Systems, of which the following is a specification.

This invention relates to automatic telephone systems in which connections are established by means of selectors and in which in case of larger plants it is customary to divide the subscribers into main groups (tenthousandths) and sub groups (thousandths, hundred-tbs, etc.) and to adjust a first selector (1. group selector) upon the de' sired main group, thereupon a second selector (H. group selector) upon the desired sub-group and finally further selectors upon the desired line. This adjustment has the disadvantage that the so-called group selectors remain engaged during the entire duration of the conversation. it has therefore been proposed to establish a connection of the found desired place with the calling station. upon a shorter path after completion of the directed selection with the group selectors. For this purpose between each two subscriber groups circumventing connections have been provided, said circumventing connections including switching apparatus for making the connection for talking over this shorter and cheaper way in case such circumventing line be excited from either side, While the directing selectors are rendered free. This arrangement, however. has the disadvantage that the number of the circumventing says will increase about proportionally to square of the places to be connected.

The object of my invention is to a mode of connecting, in which the aforesaid. disadvantage is obviated by having the auxiliary connection made between a calling station and a. desired station by selecting the direction substituted by a circumventing coi'inection which is made up of several parts according to free or directed selection. between different groups always several portions are'joined.

A connection of this kind will beespecially valuable it thecalling station is connected in the ordinary n'ianner first with a point of a multiple field, whereby the num her of these points is essentially smaller ti'ian that of the calling stations. To give an e provide epecifllcetlon of lilettere Patent.

.ainple, by double pro-selecting the these branci.

iierlel lilo. W

s irvicc of 2,800 subscribers may be reduced to connee-ting 3 uts at a multiple field. .Eaccord ing to this invention the directed selection of the auxiliary connections will begin at this multiple field and the selectors of the circumventing connection will then only need to seelr one of 10-0 points instead of one of 2 000 points. also the desired. sub-- scribers are advantageously switched upon such rnultipi. field, whereby the same preselectors or call seekers may be used as in case of a call of the respective subscriber. For the aforesaid second selection then only a simple bridging of branching point of the one or the other multiple field will have to e accomplished. The number of these branching pants can be very small as cornpared with the number of subscribers. as ng points are coinn'ion for large subscri groups (about 12,90ll subscribers) and need to be provided only in. such number corresponding to the per: centage required by the demand. Accord ingiy. also the number of the combinations at connections for he second selection will be reduced to an such as essential sizi'ialler value cnstonzaiy in case oi exclusive. foe

Ward selecting; {for instance according to the btrou or system). The bridging n'iav thereto '3 be done with few selectc The number oi? selectors, hem-Wei", may further be iced indcpen" ni .It-lfl'OlZl by em pic; J selectors an. i a larger multiple a I The ringing of the two multiple fields forward or bani: I either case' this a) will be eflected automatically by a niuneral sender associated with the branchpcint soug"..t by the second selection and which by cit '11s iatter rel. lion so connected Will innnediately furnish the curred in'ipulsee which reiplircd in case and pass said impulses over auiriliary connect-ion to the second selectors be ad usted.

My invention will be more fully understood by reference to 'the accompanying drawings ot which Figure 1 shows multiple fields for ear 'ngthe calling subscriber by means or? done e pi -selecting, 2 a t lephone system similar to that of 1 in whic a multiple can; is provided. back of the selea 'r, Fig. 3 a subscriber so accoin'alished drewings l have shown mixltiple fields is marl B upon which the ceiling sulaseribe': l or the called subscriber lll 1m be rrelw eierl by double pres-selecting, time le my, my means of e cell seeker end. e pre-selecl'or ljlie auxiliary connection being shown l3}; :2 riot ted line. This auxiliary GOIHHNEl lKWI ems n the manner as usual in the iltrowger s usize over an I. and. H. group seleeter and. e li selector which letter will excite s i seeker :rnclpre-selector Wlierelry re the desired subscriber Will be swirl-m.- 1 2r bmnching point of the multiple field ll. The final eol'meetion of the lirenelri'eg poirrls engaged at the multiple field A or will be done automatically in that the numeral sender ill} will send current impels is Weir the group selectors and (he line seleclter lo the so-called back seleciter ll-W. [liter mi justment of this selector the maxillary nee-lion which is shown in. doi'iecl lir lJQ made lllOPGlillii'VG. Before (the l. group selector e seeker S is inserted in order te be able to switch the group selecio e which are being used only for a relatively (lurim lire call, upon a larger immlber e'li brancning points. In case oi: large telephone systems l have eleviseil err errengelr wl'ricl'r is-slio'wn in Fig. In this errm meet a group selector empleyel {or i-liery as Well for firwl seleeti'ngp In order to make a, eeiineetion between the subscribersl and H, new, the following; cperetions will be merle After taking all the receiver at I r "5 tr." with the pr I ill adjust tliemselws, ce a :mgmralms upon the ce i {he ire-eel ltor egos nmlliple lie :1 comer-s cl ll. imeirl; o'E-bolli ripper will be connected with s Fig. 4. lmmeclmtcl they w:

memb of the seeker F5 in l piece whereby the subscriber neelerl will, the l. grcu n sr-selzrm ere-selector and se to be plain rotary selectors which W steps. I V

llow, the subscriber will. sell multiple nelcl ll. lay mews of ii. In the system represented-l l liell inl ereem vmellow owsr short i i roe i, actor see. e nd us'leil m smeeesier, W5; eeiistrueterl 'l'or all es of: steps, w

#1 .i epen by memos or elm ei'mteet arm 7% a, line will i153 souglil'. sirloin hie/silly mils crrlxlie seeoml rerelziioe oi llie ilislz.v re

"lament oi? he seeoml group selecjlei-"r re eecoreplw -iel, said even Elie lplnrrl "loll :hroletien f elie flislr the line H fee eeee sire minted respectively line be free the :llseel r $3.55 el'or l W" will imsee Tee l" lay the ieelieel with le field, Wl' ereu mn by cooper:

l feeder ill-l oi l i beck selector lll.

1;) the we emeeirll upon the M eoelect oil was in ed, eulemelieelly.

lilier eceorm l grouo selee selector will imi. e-fue'leljy lee "sled, Wliile (tie talking connection ovel eeelr seleeier, will remain as shown by the "lull rlrein lines. cell will be serilii. and GOHV'JI' up soon astlce I. swer the call by halting; eircuit for telling is :lirilerl eemleesers 'me hive halves Wits incl :peerlenl leeclingg fer mill llllfil'lrpllflrllfifi If: efler cempleliioe of lire eenversaitioe the two subscribers will replace the receivers the est-air lislierl eoneeeiicm will be releeszrl. on she one or other side e1: *5 eietl'y from the one or other y be taken ier Wlll fill-- subscriber.

.srrlinp; relay A "will res iceul, e e p; at 5 the rotating exegesis l'or lire cell see or presein the eireei'b of en 'inlerriwier 6, its Jr, connects the test relays l l? 1 greul'itl'el, Y 11ml ii The cell seeker and [1 ii the pre-eeleelor will role- 2s. The l i seeker new w ll ope rate until at; lvlre (301:;-

ll 9 cl? llie selling line 2 eurrenl will err w l, a. circuit being iformerl retinal i, seeker rm, 9 low re- Wi'nrliu ll) are "All", l3e""' v marl llswieelies :rlv iii the the cell. seeker out oil val: s1 lie? will step close *5 ll? llie eir ui 1 I l, l] si i is pie-sale 1' will operslse iwil re Larry re s p" it as w ll lilll:

rem the heck selector s'ttterl to "the seehe condensers inclegeedcite-c1 relays V and A herefrom until at the contacting o leading to the set of relays oi current will flow over ground, 8, in, third arm of the pro-selector, VW 1%, battery, and ground, whereby the re 1 will. .1, -11 the pro-selector latter will shop will be excited. This role. 15 the rotary magnet D or out of circuit, whereupon the its motion. P furthermore Wiil. moire husy the line 13 by short cireuiting its in r sisionce Winding ch16. Also the r subscriber line had been locked against seizure upon responding of T by interrogaiion of the line 17 at the contact 18, said line branching oil to the line selector. Furthermore T will switch the relays 111-" end A at the contacts 1 and respeciiveiy. After P and P being excited, that is to after cell seeker and preseleoeor have hot-h iaeen adjusted, C will respond to current flowing over ground, 22, 23, C battery and ground. C will extend the line of the subscriber I to a preeeiector and setof relays of Fig. 4; at the contacts and 26 one will disconnect by short-circuiring 27 the relay P Furthermore C- will close a con tactparallel to 23, whereby U Wiii he kept further excited independently of F C further opens again the circuit for D and D at the contact 29.

In Fig. 4: the impulse relay J which connec 'ed over 30 end 31 with the subscriber I will respond and therewith also the re turding relay V and starting relay Relay V switches retarding relay V into circuit at 24-, said relay V opening the contact 14-. for the purpose of subsequent iease of the cell seekersnci' pro-selector. A causes the seeker S of Fig. 5 to start by switching the rotary magnet D into an in terrupier circuit at 35. This seeker will operate until it finds the line 37, characterized by the relay V by closing contact 36. In this case the following testing circuit will be made: 'rounol, P", seeker arm, 3?, 36, V battery and ground. P switches {the rotary nmgnet D out of circuitet 88, whereupon -the seeker will stop. PT furthermore shortcircuirs at 39 its testwinding, out will further he hep; excited by a contact rloscfl by J over Z and. 4-0. By the shoricircuit of the one Winding P has been made a retarding relay which is importena'; for the operufion following. P has closed ii m (Ilifllli' for the impuise reley J aid circuit hclng mode over ground 1r 4., 42,

4-3, seeker, 4.1, J, switch arm, 3-, ln-"ufi ince, battery and ground. As regards 3hr or rnng'enwni shown in Fig. 4 it mush further he noteal that the testing current flowing over line 37 has excited the retarding V whereupon this ietter wiil hoiri iusel f over 45, 32 until the end of the conversation while it Will switch of? he previousiy'erin order not to furthe" effect the seeker S' of Fig. 5. V after V being denergizeci, will further maintain at the current for V so that the luster relay will he kept excited.

Secoed-Frc$ whoring controiiled from the swosm'ioer.

151 the subscriber rotates the disk, the o ren'iz iiorrir in the line over J in Fig. 4; To inizerrnpieri one or several to whether he will. choose W: or hi h number, each interruption will cause a. Hing of the lovers of the impulse relay J J Wili transmit the current imseleceore. The short; openceives at each rleenergizing of J a current llTiPUJ hitting the selector arm by one step.

rirre'r one last current impulse J will keep s errnetnres attracted for some longer time cruising;- the failing of the levers of V. With V also Wlli be iieenergized. St upon the backward motion of the armature switch. the control levers 44. end.50- from upon the second contacts.

Herein .ierer 51 will insert the rotary irregizo the circuit of on infierrupter 104. D comics the selector :irm'hy steps from one has nominee ice the other. If the selector arm con fiects with the line to the H. group selector of Fig. 6 which is supposed! to he test relay T? will respond and inpt the circuit made during the operaof D over St at 56. Consequently the i-urol levers will more into the third position. Lerer 51' switches D out of circuit-,- lever I55 switches P or? ami lever :33 makes busy the found line by ground- Lever switches J over to. the H. group selector, whereupon in the letter the impulse relay J and recording relay will respond, a. circuit for V being formed over ground H 5?, 58, V hosiery "l gmunci. The winding 59 of V is of resistance fzhat- H Will not or pon the second rotation of the diskof the sub criher the current fie-Wing over J {uni J Wili he shortly inrerruptecl one or i. times. sensing a circuit for strong to if; at each time closed at 60 for At the first step witcherl off at 58. over its second until after the Thing magnet H Which lifts the segm um last; current impulsu when the coniamaix fifl Wlii. renmm Opened i501" Emmi} l 2'1? 011i; 0f (ii-cum; and. at 32:3 Mm mlmizey my cui'i; buing :Ecmncc l over grwn 53mm A D *3, 6%, 65, 56 115mg dosed. at. 1am first .h'ft-ln step 0'); the sebum 1mm), 1') My umti.

ground. I) Wiifi rotate Him. w until 1111011 mntuxzting 0i? a 11119- With 1:. sup posei fqee 1:] no selecto of: Fig. 7, the taai; relay 1? Wii}, respond and opus- 0 the circuit for D at P will make, has the 611m 7 line by I nnnmr'fiai" ;;1'011'1Ui'h1g; nit W3." ram further keep :1 Levi .(1 )5 I. second winding: M3 11?, 69. P farther will discomlect iihr iznpu'lsa rainy J at 9% a (1 switch the 01wv at lmu i'mg from: a. J over to the 11:1 19mm in Whlflh. MTW thu impulse mlzzy t) and the retarding}: reys V V V will l'Qspoifl. V :1116. V are switched in'm circii'lt Q at Z9 anc i. V is sw'hiwzhe into circuit by 1 0.111 71L Upen tha 21111: utution of the disk at the wbscfibers shaman, the (3117'101'! t1 flnwingovm' J and J will bu shortly in'tw nptcd mm 91' several times amusing at {each 1e :1- current to How :ifx'mn 55 in 7Q 0W1 the lifj'liiwgr m m net H. will lift Mm fit'zsi *1.

' m: first 'Each cmrmnt impu iac 0V5]: 11.2 1 selector arms by one Step. At step the (101mm Y5. 76 "will 0.1050. The. opei'zing" at '5 at effect the ewzcitefli 1511-- kmps a r walla}. (zim'ilmzi. 3 in dcfiei mimfiuiml. 'lihc opening .11; 76 Wili.

cause V in Emma its lever fall off nits" lash lifting curl-em; ilnmulsc my} to a.

mild lust mmtion mi. somber at." 3011., than pulses W11. oven:

the dial-1 ground. mm rotate Lhi: s fishing 1:110, the first 'o'tming stem the Win will be switche'. 01% at 81:3. after the last ailment imp-LU, V will. fall 'Dif 2.211? smiiah wit at Y1. W. mcnunt 011' 'V' Wm fall 0T3? @mmmn 1n the KHWUUJJILEB the. upon W1... 01,1 ifh a Se} can; be tested,

retarding; relay V have fully failem -05? lfihe J" will be) disconnected frbmline 94:. H

other line. TM-=05-Sewmci select mcontmllad from 25% Mm mmugh-cmin.ecting of the line 91 J 5/? the cal] relay 1% ef the subscriber 1.1. will respand. R willfcause the'acijustmeni; M the cal]. seeker and the presaelacim- WW. The adjustment of 700th apgnwa tus at first will be done in. the sauna man-m1: m5 de'suribed. under the first mm; 0f H1155 s 6Qifiifififi0fi for tin-3' calling subscriber a. ijlm call seeker AS adjusts Itself and in? inst ramy P will start the preselector VW" by ulosaixw the mutant 201. The difiermma exists snlely therein'that after 'aij ustmems m. 1,111. cull seeker in this casa the retarding ralag; V inserted everthe line 92 will responcl, while E17- becomesdenergized. V causs afithe l'evel'sing relay U to respond whereby 't'ha test relay P wifl be switciwcw. m es." from $116 thiscdupoli the fourth pre mylactmr For 'hha understanding of this operation it is to 3% vnoted that tha pre-selcctor is: sonnected with two kinds of trunk 1111 a, namely, lines leading to the multipia field for the calling; subscribers (Fig. 4c) and Rims Eeading t0 the multiple field for called. sumscribera (Fig. 9). U3? either M1151 432i hunk HUGS M10111; the same nmriber is pro "viefiucl bu; J they are nbnnected. to the contact sum of the, prwsalectsrs in. a, difierent mum mi? in sc far as the "third strands am switchml in one case upon the: third, and. in another. @2156 upon the ixmrth Contact arms. Thewfmre flu" prsz-iseleqtor may test aithw "upon .the 0m or upon the other group 0% lines as desired and choose a. IEIQQ lime 21.0-- cordi to "whether the tesi; relay 3? comlecmd. either 1ipon the third. or upon fom'th selector arm. The switching 037153???U545,- the basis relay P 1111011 thefourth arm, m5 effectecl intthe arrangement of 3. by U will cause. the pre selectai" t0 ucljusffi lizself upon {he smpposea", free line of f9, THEM-Pb P and. C will reSpond. ths z-rwm 21's bciew as P is 211mm xcite. U re mains mwi nsfi BVQT 101 and 1.62 imtil tha am} Mr lrha mnmmbiun in wikmtu x'imintain' 51w mmrnm; 01 '3? u'u wlmnged, W will baa. switc'md 0f? at l 8 11pm; responding of Q and kept excited M235 weir VW, 9'3, 93, 3' my mm? gmmni J? i'as'prmfis swiic rxfies M: the fcemfiing relay V? ime M J in which. in adjmiw T? is amntiimm'isly insa'rted mm. ti'muit closes at each win m 5hr; subscriber stmimn I? n. rri 'r selector will respond three times more and ground. The arm 168 will accordion to this also bring the controlling switch from position 3 into position 6: It the desired subscriber. line is free J will remain excited in position 6 of the control switclne circuit being formed over ground, battery, 7 B 1.99, 92, Lil, 96, 91, llLG /V, 95, LGW, td, 4-1, S, 43, 42 and ground, as in the line selector the impulse circuit will remain. closed at 96.. Now, the magnet St for the control switch will obtain an interrupting impulse over ground, 105, position?) of the arm 50, (it, battery and ground. Hereby the control levers will be brought into position 7.

Now, the numeral sender ZG will begin its operation by sending current impulses over ground, 106, 52, D 107, battery and thereby be moved forward in steps until it reaches the contact switched onto battery by the seeker arm 109. Thereupon the test relay P will re spend and interrupt at 58 the current flowing over St, whereupon the control levers will more into position 8. blow, D will receive current impulses which rotate the arm-.110 until the arm 110 will fund the contact switched by theseeker arm 109 onto battery and until the test relay P will again respond. By this the current flowing over will again be interrupted and consequently the control levers will be brought into the end position Thercupon, as more fully described below, the group selector and the line selectors, as Well as the seeker and the nunierul sender Wlll be released or made free.

The number of the current impulses for I) and D" is a dili erent one for each position of the seeker or foreech branching point of the multiple field (Fig. i}. It depends upon the position of the seeker arms. As the back selector is arranged for lifting and rotating, each branching point will be charucte'rized by a two-ciphered number, and the contact .tield 'or the this? seelrer arm formed.

The current impulses received from D end D will be transmitted by moons of the contacts 111 and 119; connected "with these magnets upon the back selector vover the control lever after the relay J has been. switched oil by control lever 14. Each open log of the contacts 111 and 112 will cause the relay J in Fig. 9120 be cuice deenergized,

the circuit leading over ground, battery, J, ea or. we, 25, 93, us 99, 5W, e6, ground.

or. new, row, 55, 111 and ll be excited. The

by closing also V wi h st series of current impulses generated repeated opening of contact 111 will now be transmitted at the back selector uponthe lifting magnet H follows:

ground, battery H 116, 115, V 114:, 113',

ground. if, being retarding will rcmein lever 116 will switch the "D into circuit instead of the lifting magnet will close so that if after the completed, series of current impulses IV will be released, V will be excited over a circuit mode by ground, 113, 114, 119, Y, 118, battery and ground. V by reversing of its rotating magnet H The succeeding series of current impulsesoriginating from 112' therefore will be transmitted to the rotating magnet D, .V then again responding and closing contact 117, while 114- stop of rotation. vAfter the last current impulse for rotation first V" and somewhat later also V will be dcnergized. In the meanwhile the relay V will be switched into circuit over ground, battery, V 120, 121, 122, 113 and ground. V will hold itself over 123, 124; and switch the bell relay L at 125 upon a slow acting interrupter, whereby L will be excited in regular intervals and send alarm signals to the called subscriber. After completed adjustinent oftheback selector V in Fig. 8 and J in Fig. 9 will be made inoperative,-the circuit for these relays being interrupted at the I. group selector at control lever 1 or 45. V will extend the line at 93 to the subscriber II. v J opens the contact 103, whereby the retarding relay V will be made dependent on time contact Z.. The latter serves for releasing theback selector, if the called party does not answer after having received a certain number of alarm signals or after a certain number of excitations of the switching magnet D.

If the subscriber called for nownnnouuces himselfby taking oil his receiver the supervisory relay U in. Fig. 9 will respond and close the talking circuit which is shown by heavily drawn lines at 126, 127 and will switch off the relay V at 124 and therewith also D and is. With U also J will respend and again maintain V .indcpendently of the time contact Z" for the entire duration of the conversation. v

Fmmth-Jicicasiug the selectors.

The I. and II. group selectors, line selectors, seekers and numeral senders in Fig. 5 will immediately bemade free after completed adjustment of the back selector. Duringz motion of the control leversinto position 9 will be switched off at 4:1 and therefore made inoperative. Thereupon "the armature of P will also fall-cit -with some will open after the first.

' erotire. Upon. P

be interrupted at 1.30 if the sercrcjl opporatus will come into positionv of rest, 'llic control lever 53 also interrupts 'tlie'currcnt for l? in Fig. 6,Wl1 upon st 65 the rclcosc magnet M will be switched int-o circuit. ll/l releases the second group selector. Elimilar' the line selector will bc released by bu ing the current for P interrupted. by the back motion of the contact arms of the. sccond group selector, P will close at 131 the release circuit for M after al has alrcody closed contact 132.

lo. a siiiuilor manner the rclessc oltlio group selectors, the line selectors and seekers is accomplished if in scribcr line is found to be occupied. Tho control. switch of tho group selector is at tho rcspcctivc instant in position 6. ll bcrcby in the line selector the contact 96 the test relay P liool not been closcd, J and also P -will remain inopcrotivc. The fur tlicr release will take place just described.

Relay 1 also will be automatically si'vitchcd oil independently of the selecting operations by means cl? o time contact ill, WlllCl1 i'uoy be made by a slow operating switch gear in coco the calling subscribcr be taking; too much timc in. making commotion.

H the calling subscriber hangs up tlic ro ccivcr, J in l i ,4: will bccomc inoperative, also V and with some retardation also l lo the meentimc line 1.3 will also be inter ruptcd at i l and l in Fig. l bcco'mc loop- 6 will. follow by reason oi the current being interrupted at 22, and upon will follow T by reason of intcrruption of current. at 527.

ll the called r-aubscriber, now, will hang up tho receiver 3*" U will become inoperative d switches oil V at 1 .03. The lovers of V will fall back a little retarded, whereby contact 1" switclics the release magnet M. into circuit, wliilo will interrupt tlic cul" root for l?" in l irr. 8, here siiiiilmsly to l i, ll

the relays u" zuicfl Wllllflll oil and also ll *cby switched oil at I oy il steed oi"? arranging the; iiniltiplc field miutely bcliiil tl'ic prcsclcctors Vl i 2i gzooup solcctor GW ll may be inserted bctwccr \id presclectors and lbw multiple mid 1i rory lo systcms tlc. sclcctor is to sol-cc mo oilicc to which the. dc-

com ectcd, 'll c preliminury cod 9' toll-up; circuit prcfcrebly "5 i. over: inc circuits ol the olllcc of All, o Mircd subscribers lino.

' The insertion of the group selector GW between tlic pre-sclcctors Wi l id the relay cot l does not cliccgo the arrangement 6% ci :1: one of those cots, tlici ore the forc- 5min operations cl. tho pro limilini'y cud ilic tolls tlic dcsircd lino rl mimmuu, l q

mowing llws ooscribcd.

.l, mus W itli d.

the line selector it sub clcim as new and desire to secure by Lettcrs Potcnt oil the United Stotes:

1, A. telephone exchange s stem, comprising subscribers stations, s11 scribers lines, trunk lines, selectors liminory connection tion and or called station,

between it calling Sta a plurality of for establishing a prc- 'Ill switches in. series for establishing a talking meeting a calling 's'ubscribors line with said first multiple field, automatically operating switches for connecting 2, called subscribers line with saidsecond multiple field, switches for interconnecting the contacts of said multiple fields, and means for releasing said selectors of the preliminary connection.

3. A telephone exchange system comprising subscribers stations, subscribers lines, trunk lines, selectors controlled by a calling 1*! tion between a calling station and a called station, a first multiple field with contacts less numerous than the number of subscribcrs lines, a second similar multiple field, switches to interconnect the contacts of said multiple fields, automatically operating switches to connect a calling subscribers line with said first operating switches to connect ascribcrs line with said second multiple field, some oil": said automatically cperetin switches bcing used Well. for calling as for coiled subscribors lines, and said selectors of the preliminary connection.

4-. A telephone exchange system comprising subscribersstctioiis," subscribers lines, trunk lines, selectors controlled by a calling station for establishinq c, relimine conllBG'lLlllIl bet'wceo :1 calling and it called stati' 1 tiple lields o plurality of automatically op crating); switches for connecting a calling subscriber's line with said first multiple field,

automatically operating switches to connect :1 oollcd eubscribcrs line with said secoiid nmltiplc licld, said selectors being branched oila lrom the contacts or" sold first multiple cod.

5, A. telephone exchange system compris multiple field, automatically called sub station. forestablishingo-p 'eliminary coimecmeans for releasing first multiple field with contacts less lug subscribers stations, subscribers lines, trunk lines, selectors controlled by a calling station multiple-fields with. contacts nnmerous than said subscribers lines, auto matically operating switches for connecting; said subscribers lines with said. multiple fields, said selectors controlled by coll" j station being branched oil from the contoc of one of said multiple fields and arrow to establish a preliminary connection lltilil said calling station to a desired station,

switches for interconnecting the contacts of said multiple fields and establishing c tailliing connection between said sub -'bers lines, and means for releasing said prclimi nary connection after establisl'iing Slilfll tall; ing connection 6. A telephone exchange system, comprising subscribers stations, subscribers lines,

trunk lines, auton'lntically operating switches,

a multipl, field with contacts less i'rumerons than said subscribers lines, selectors corrtrollcd by a calling station being branched oil" from contacts of said multiple field for establishing :1 preliminary connection b tween said ceiling station and n col tion, sold inultiole field being; conncc Ci some contacts of said automatically," opernb ing .YllCllCej, another multiple field WM. contacts less numerous than sold snbscribers lines, said second multiple field being connected to other cont-acts'of said autonnitt cally emf-ruling switches and sWll i188 for est-nbl' ing a talking connection between said. lib. ibsrs stations said second mu ipie field billing to said named switches.

T. A telephone exclringe system corn prising wribers ions, subscribers lines, trunl; line outon'nitiwill y' operating 40 switches, selector controlled by a calling station for establishing l prclii incry con ncclion between said Collin station and a desired station multiple holds with contacts less numerous than said subscribers lines, said automatically operating switches connecting said subscrib lines when cz1ll in and when called 'Wlill said multiple [fields SWll'i'l'l-ES to connect tie contn the multiple field of the cnllinh lc th:: contci-s of the 'iniilti iile l'lflnl ol'f Elie i called side, the morcbie coi'itocls of said inst nientioncd 'sivitc being connected to the contacts of the mult ple field the rolled side" fields for establishing a preliminary conne tion with desired station, switches for cstnblisliing c talking connection between the contacts of said multiple fields, said talking connection releasing and replacing said pie liniinory connection. to

A, lclcplmno exchange system coin prising subscribers stations, subscribers lines trunk lines, ontonmticelly operating switches, multiple. fields with contacts less nomerous than said subscribers lines, sold Y5 oiitomaticolly operating switches connecting said subscribers lines when calling or called with said multiple fields an impulse generating device associated with said contacts said multiple fields and generating im- =30 pulses corresponding to the location of the said contact-s it becomes associated with, other switches for establishing it talking connection between said contacts of said multiple fields, said switches for cstoblisbir the talking connection being set by the olscs generated by said impulse generatdevice.

10. A telephone exchange system coon prising subscri ers stations, subscribers so lines, trunk lines, automatically operating switches multiple fields with contacts,- lcss numerous than said subscribers lines, said ain'zoniatically operating switches connecting said subscribers lines when calling or called with said multiple fields, other switches for establishing a preliminary connection, partially including some said not noticall v operating svvitclies between i sold multiple fields another set. 1W .tcl'ics for establishing a talking con ncction between said contacts of said multiple fields, an impulse generating device becoming; assoc lied with contact of said multiple fields and generating impulses cor responding to the location of said contact i; becomes associated with dedvering its impulses over said preliminary connection. to said switches for establishing the talking connection. rm

11. A telephone exchange system comprising subscribers stations, subscribers lines, automatically operating switches, multiple fields with contacts less numerous than said subscribers lines, some of said flllllOHll1ilm5 ca-lly operating switches connecting a sun if ers line when calling with one of said nnntiple fields, some others of SFLld automatito operating switches connecting a subs line when called with another of iul'tiple fields, selectors controlled said milling line for establishing; a no ry commotion with said calls on between said Inuit 1e fields, an impulse general levies becoming associated will: the r oil erd contacts to: ssid multiple fields co prising suhscribers stmtions lines, trunk lines, eutoinaticelly Opel-stingy scrihei's lines vie ed to the calling line, generating impulses corresponcling to seirl cont ct, delivering; said impulses over seicl preliminary connection and over said eutomet zally operating switches of the called suhscrihers line to said set of switches. for establishing iii log connection and setting" same to seitl con-- tact of the multiple field connected to the calling subscriber s line.

7 {1.2. A. telephone exchange system comprising subscribers stations, subscribers" lines. trunk lines, two multiple fields with contacts less numerous than said subscrihcrs lines,

two sets of automatically operating switches in series, the first set of said automatically soul sno operating" switches connecting scfibeis lines Wlth the second set oisemi.

automatically operating switches te ting; circuits no soul second set for SF toting s 'if-ree contact oi one of said multiple liehls,

selectors controlled. by it calling suhsmribee's station. to SSiZttbllSll a preliminary connection of the contacts of said n'ulltiplc field. with the desired line, it circuit extending szucl pitclinlinexfy connection through the first set oif said etitomatically operating; switches cons 111g a change in the testing circuit oi: seirl second set of automatically operating switchc and adapting it to select a free contact of the other of seiel mnltiple fields connected With switches i'oi' interconnecting the contacts of said two l niltiple fields.

13; A telephone exchange system. coulsubscribers multiple field with contacts less IUHHG'JTOUS than said. subscribers lines, second similar multiple fieloi, said ee'ltoi'limticelly operating switches connecting said suit when calling with Sillfl first multiple field and. when. called with said second multiple iield, s set of selectors to he ajusteli by a calling subscribe s line, re: vs associated with the contacts of s multiple field, ssirl relays connecting ssirl callin line with seitl set'o'f selectm's to! establishing {L preliminary connection with the desired suhscriocfls line, and. means to connect the contacts o'li siliil multiple lielclsu switches, e first meeting said, 1-3llllS-1Cl'lll0i'ft lines tlrolleel by impel is generated by said in1-- sznnl impulses being pulse e enci'eting device. tirsmsnnttell over soul preliminary connection. soul pi'elm nary connection consisting;

oi twoleeclsnml associated contact arms and operating; clays.

15. A. telephone cxchnnge system comprisin; s'rlliscrihers stations subscribers lines,

tl'nnl; lines selectors con trolled by n calling Stet-ion iioi' establishing e, preliminary eon ncction between :1 selling station enol e celled station, s first multiple field. with. com toctsl a minaerons then the. nominee of sub scribe/"rs lines, at second similar multiple lhs'nl automatically operating switches "lore connecting ceiling snhscribers station with seicl m1: multiple field, entorcetice-ll y" operating switches for connecting s cslleeil subscribers lllB with sci l. second multiple of ssirjl multiple lielcls, ssiol switches ho coi'i'csponding trunk lines being er iqeilnjccl i'foi' conttol over two Wires se a iii-telly, lll'Ml. means for releasing Sfilll switc ies of the p:z'cl.iininnry connection.

in mess whereof l lull-W hereunto set my sign 1 ,Je in the pi some of two sohsceibing loom sessile.

, switches :loii' interconnecting the con--. 

